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<p>This study aims to develop and characterize functionalized CNTs-reinforced chitosan/SiO₂-aminopropyltriethoxysilane (APTS) nanocomposites (CNTs concentrations of 0.00-0.04 wt%) of carbon nanotubes) with enhanced structural, optical, and antimicrobial properties. The nanocomposites were synthesized through a combined sol–gel and polymerization method. The resulting nanocomposites, comprising functionalized chitosan/SiO₂–APTS reinforced with CNTs, were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), UV–Vis spectroscopy, and thermogravimetric analysis (TGA). The TEM analysis confirmed the evidence of dispersing functionalized carbon nanotubes within the chitosan/SiO<sub>2</sub>-APTS matrix. Assessment of thermal stability for the nanocomposites was performed using thermogravimetric analysis in the presence of a nitrogen atmosphere from 25&#xa0;°C to 700&#xa0;°C. UV-Vis spectroscopy measurements unveiled valuable insights into the absorption characteristics and band gap values, which were further examined concerning the CNTs ratios. The antimicrobial activity was assessed using a direct turbidimetric method against various organisms, encompassing both Gram-negative and Gram-positive bacteria, as well as filamentous and unicellular fungi, and exhibited a noticeable 25% enhancement in activity following the addition of CNTs. Notably, the sample containing 0.04 wt% CNTs exhibited higher inhibition percentages than the reference antibiotics under the same turbidimetric test conditions; however, this comparison is method-dependent and does not imply equivalent or superior pharmacological efficacy.</p>

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Fabrication and Characterization of CNTs-Doped Chitosan/SiO₂ Nanocomposites

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • A. M. Mansour,
  • Ahmed M. Bakr,
  • Mohamed S. Hasanin,
  • Ali B. Abou Hammad,
  • Amany M. El Nahrawy

摘要

This study aims to develop and characterize functionalized CNTs-reinforced chitosan/SiO₂-aminopropyltriethoxysilane (APTS) nanocomposites (CNTs concentrations of 0.00-0.04 wt%) of carbon nanotubes) with enhanced structural, optical, and antimicrobial properties. The nanocomposites were synthesized through a combined sol–gel and polymerization method. The resulting nanocomposites, comprising functionalized chitosan/SiO₂–APTS reinforced with CNTs, were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), UV–Vis spectroscopy, and thermogravimetric analysis (TGA). The TEM analysis confirmed the evidence of dispersing functionalized carbon nanotubes within the chitosan/SiO2-APTS matrix. Assessment of thermal stability for the nanocomposites was performed using thermogravimetric analysis in the presence of a nitrogen atmosphere from 25 °C to 700 °C. UV-Vis spectroscopy measurements unveiled valuable insights into the absorption characteristics and band gap values, which were further examined concerning the CNTs ratios. The antimicrobial activity was assessed using a direct turbidimetric method against various organisms, encompassing both Gram-negative and Gram-positive bacteria, as well as filamentous and unicellular fungi, and exhibited a noticeable 25% enhancement in activity following the addition of CNTs. Notably, the sample containing 0.04 wt% CNTs exhibited higher inhibition percentages than the reference antibiotics under the same turbidimetric test conditions; however, this comparison is method-dependent and does not imply equivalent or superior pharmacological efficacy.